Two Wire Detector Base 6-Inch. Install the D261AW Two-wire Detector Base in 12 VDC or 24 VDC circuits where an alarm LED is not required. It can be used in a circuit with the D290M Two-wire, 12 VDC/24 VDC Multiple Detector Base and a D125B module with the D7212, D7212G, D7412, D7412G, D9112, D9412, or D9412G Control Panel or the D9124 Fire Alarm Control Panel (FACP).